Evolution (IMAGE) Université de Genève Caption This image shows 0.3 mm foraminifera made up of a single cell surrounded by a limestone shell. Credit © Jan Pawlowski, UNIGE Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.